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The efficiency of Carnot cycle is maximum for
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When a closely-coiled helical spring of mean diameter (D) is subjected to an axial load (W), the stiffness of the spring is given by
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4
The main cause for the irreversibility is
A. Mechanical and fluid friction
B. Unrestricted expansion
C. Heat transfer with a finite temperature difference
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4
The efficiency and work ratio of a simple gas turbine cycle are
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When a beam is subjected to a bending moment, the strain in a layer is __________ the distance from the neutral axis.
B. Directly proportional to
C. Inversely proportional to
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According to Avogadro's law, the density of any two gases is __________ their molecular masses, if the gases are at the same temperature and pressure.
B. Directly proportional to
C. Inversely proportional to
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A body is subjected to a tensile stress of 1200 MPa on one plane and another tensile stress of 600 MPa on a plane at right angles to the former. It is also subjected to a shear stress of 400 MPa on the same planes. The maximum normal stress will be
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The sum of internal energy (U) and the product of pressure and volume (p.v) is known as
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One reversible heat engine operates between 1600 K and T2 K and another reversible heat engine operates between T2 K and 400 K. If both the engines have the same heat input and output, then temperature T2 is equal to
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A bar of copper and steel form a composite system, which is heated to a temperature of 40°C. The stress induced in the copper bar will be
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The amount of heat required to raise the temperature of the unit mass of gas through one degree at constant volume, is called
A. Specific heat at constant volume
B. Specific heat at constant pressure
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When wood is heated with a limited supply of air to a temperature not less than 280°C, the resulting fuel is
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A cycle consisting of one constant pressure, one constant volume and two isentropic processes is known as
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Two shafts 'A' and 'B' transmit the same power. The speed of shaft 'A' is 250 r.p.m. and that of shaft 'B' is 300 r.p.m.
A. The shaft 'B' has the greater diameter
B. The shaft 'A' has the greater diameter
C. Both are of same diameter
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The entropy may be expressed as a function of
A. Pressure and temperature
B. Temperature and volume
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The efficiency of Diesel cycle with decrease in cut-off
C. First increases and then decreases
D. First decreases and then increases
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A steel bar of 5 mm is heated from 25°C to 45°C and it is free to expand. The bar will induce
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4
The weakest section of a diamond riveting is the section which passes through
D. One rivet hole of the end row
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The following cycle is used for air craft refrigeration
D. Reversed Brayton cycle
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A column that fails due to direct stress, is called
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Youngs modulus of a wire is defined as the stress which will increase the length of wire compared to its original length by
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Which of the following has the highest calorific value?
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When two bodies are in thermal equilibrium with a third body, they are also in thermal equilibrium with each other. This statement is called
A. Zeroth law of thermodynamics
B. First law of thermodynamics
C. Second law of thermodynamics
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According to kinetic theory of gases, the velocity of molecules __________ with the increase in temperature.
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Charles' law states that all perfect gases change in volume by __________ of its original volume at 0°C for every 1°C change in temperature, when pressure remains constant.
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The value of shear stress which is induced in the shaft due to the applied couple varies
A. From maximum at the centre to zero at the circumference
B. From zero at the centre to maximum at the circumference
C. From maximum at the centre to minimum at the circumference
D. From minimum at the centre to maximum at the circumference
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The efficiency of the Carnot cycle may be increased by
A. Increasing the highest temperature
B. Decreasing the highest temperature
C. Increasing the lowest temperature
D. Keeping the lowest temperature constant
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The hyperbolic process is governed by
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A simply supported beam with a gradually varying load from zero at B and w per unit length at A is shown in the below figure. The shear force at B is equal to
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The property of a material which allows it to be drawn into a smaller section is called